The Medium

I got this and Inner Investigator early on without even trying because I made a point of inspecting every possible object--this one popped right before I entered Niwa's main building. If you're achievement-hunting, you're basically guaranteed to get this naturally as you play, and even if you're not, you end up interacting with enough objects through normal gameplay that you'll probably get it anyway. Just wander around enough to get in range of interactable objects and follow the button prompts (on PC, left-click is the default for material-world objects, and right-click is the default for spirit-world objects).